Disk-sharpener



(No Model.) 2 SheetsSheet 1.

P. N. HOWE.

DISK SHARPENER. No. 592,785. PatentedNovQ 2 1897.

WITNESSES: 'INVENTOR W 7%. %m PETER [wows W all/Z ATTORNEY.

2 Sh sets-Sheet 2.

(No Model.)

P N HOWE DISK SHARPENHR.

No. 592,785. Patented N ov. 2,1897.

INVENTOR PETERNTH OWE 'BY WITNESSES:

' ATTORNEY. I

' the split collar.

UNITED STATES PATENT QFFICE.

PETER N. HOWE, OF MALTA, ILLINOIS.

DlSK-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 592,785, dated November&, 1897.

Application filed April 19, 1897. Serial No. 632,751. (No model.)

To aZZ whom it may concern.-

Be it known that I, PETER N. HOWE, a citizen of the United States, residing at the town of Malta, in the county of De Kalb, in the State of Illinois, have invented a new and useful Improvement in Disk-Sharpeners, of which the following is a specification.

My invention relates to improvements in sharpeners for the disks or colters of disk harrows and plows; and the objects of my invention are, first, to provide a device for sharpening each and every disk or colter of a disk harrow without removing the disk or any part of the frame of the harrow; second, to provide a sharpener which will fit upon any-sized axle and which will not be hindered in its workin g by any ordinary obstruction on the axle; third, to provide a sharpener which will be adjustable to sharpen a disk of any size; fourth, to provide means for giving any desired bevel or angle to the cutting edge of the disk with accuracy and uniformity; fifth, to provide the other details herein shown. I attain these objects by means of the mechan ism illustrated in the accompanying drawings, in which- Figure 1 is a side view of the sharpener in.

position upon the axle, the axle being shown in section with the knife in place against the cutting edge of the disk. Fig. 2 is a top View of the sharpener in position to sharpen the end disk of a gang, showing two disks and a portion of the axle, the end disk being partially broken away to show the distancing piece or guide and the dotted lines indicating the device in position to sharpen the adjacent disk. Fig. 3 is a view of the split collar or clamp on the axle, showing the rounded eye at the inner end of the main bar placed in the hook at the lower end of the rod on Fig. 4: is a view of the knife in perspective. Fig. 5 is. a view of the distancer in perspective. Fig. 6 isa perspective View from the inner side of one piece of the split collar. Fig. 7 is a view in perspective from the inner side of the piece of the split collar which carries the lugs. Fig. 8 is a in Fig. 3.

the knife-holder. Fig. 10 is a vertical section of the knife-holder, taken through the center thereof on the line 10 10, Fig. 9, and showing its hook-bolt with the thumb-n at and washer.

Similar letters refer to similar parts throughout the several views.

The split collar or clamp for the sharpener is composed of two principal parts A and B, designed when assembled to embrace the axle C of the harrow in such manner that the split collar can be rotated in a plane at right angles to said axle.

The parts A and B are designed to be united by means of the pin 19 and the thumb-screw b. The pin 5 is securely fastened to the part B and-fits into the aperture a in the lower portion of the part A of the split collar.

The aperture a is smooth and of such di-' ameter as to fit the pin 19 closely, but without binding it. The thumb-screw b is threaded throughout the greater portion of its length and is provided with a thumb-head b by which it can be turned. The thumb-screw b passes through the aperture 19 in the part B and fits into the threaded aperture a in the part A of the split collar. The aperture b is smooth and slightly larger in diameter than the diameter of the thumb-screw b and permits said thumb-screw to slip freely through it, but without lateral play, so that the head b3 of the thumb-screw comes to a bearing on the part B. The two parts A and B of the split collar may thus be fastened around the axle of the harrow by placing the pin Z) in the aperture a, passing the thumb-screw I) through the aperture 19 in the part B and Said hook-rod d extends through the lugs a and c and carries the thumb-nut d at its upper extremity and the hook d at itsopposite end. Said hook d is large enough to receive, detachably, the eye 6 011 the inner extremity of the bar D. The lower log 0 has the retaining-lip c thereon perpendicular to said lower lug c.

The main bar D, having the slot 6 therein, fits at its inner end between the lugs c and 0 above the lip (2 Said bar D has at its inner end, where it fits into the said lugs, a rounded eye a therein to permit the rod (Z to pass through it. Said bar D extends outwardly and ends in a handle D.

The distancer E is a bar forked at one end to carry the small caster or roller f, said caster being designed to roll upon the surface of the harrow-disk G. The body of the distancer E is provided with a series of apertures f, occurring at short intervals throughout the length of the bar and of sufiicient diameter to receive the shank of the hookrod d without binding it.

The thickness and breadth of the body of the distancer E are such that the body may fit easily into the lower part of the lug c and be held in place by the retainin g-li p c thereon.

The rectangular washer His approximately of the dimensions of the under surface of the upper lug c and of a thickness slightly less than the distance between the upper edge of the lip c of the lug c and the under surface of the lug c.

The washer H has an aperture 7L of sufficient diameter to receive the shank of the hook-rod (1 without binding it. Said washer is designed to hold the distancer E down in its proper position in the lug 0 when the main bar D is attached to the part B of the split collar by being hooked into the hook (I in the manner shown in Fig.

The knife-holder F is formed of a small block of wood or metal and is designed to rest upon the upper surface of the slotted portion of the main bar D, and is held in position thereon by means of the hook-bolt F, which passes through the aperture e in said knife-holder and through the slot 6 in the main bar and is held by the thumb-nut c and washer e against the under side of said slot.

I11 the surface of the knife-holder F-and extending entirely across it is a recess 6 cylindrical or approximately cylindrical, intended to receive the central cylindrical portion or shank 7a of the knife I, hereinafter described.

The surface of the knife-holder F may be recessed at g to clear the end of the hook F. The hook-bolt F engages at its hooked end a the said shank 7a of the knife I, and said bolt is long enough to extend through the knifeholder F and the bar D and to hold a thumb-nut e and washer c at its threaded end 6 The knife I has a cylindrical portion or shank 7a, which is designed to fit into the recess e in the surface of the knife-holder F, and a blade 7& at each end of said shank, said blades having a greater length than width.

It is preferable to make the knife-blades in the manner shown, having two sides flat and parallel and two other sides grooved. The grooves m m are formed by hollowgrinding the knife, and in this manner the knife is provided with eight cutting edges. It is also preferable to make small parallel roughs or notches in the surface of the central portion 70 of the knife I and extending lengthwise thereof, and the knife-holder. 1*, before mentioned, has, preferably,-similar notches in the recess 6 The inner side 6 of the hook-bolt F is preferably notched also. The purpose of these notches is to pre- Vent rotation of the knife when it is clamped between the hook c and the recess c in the knife-holder. It is obvious, however, that the shank 7c of the knife instead of being made exactly cylindrical may be made octagonal or of any other form which permits the knife to be rotated on the holder with facility. By this construction of the knife and knife-holder the knife may be adjusted in three different waysnamely, by rotation upon an axis lengthwise through the center of its cylindrical portion, also by rotation in a plane parallel to a plane which is approximately determined by the axis of the disk-axle and the direction of the main bar D, and, further, it may be adjusted lengthwise of the slot 6 in the said bar D.

In operation the split collar is placed upon the axle G in the manner above described and the belt I) is tightened until the partsA and B of the split collar clamp the axle of the harrow in such a manner as to rotate freely in a plane perpendicular to said axle. The distancer E and the eye 6 of the main bar D are then placed in position in the lugs cand c of the part B, and the hook-rod d is inserted in the apertures in said lugs. The thumb-nut d is screwed upon the threaded shank of the rod (1 until the hook on said rod (Z comes to a bearing against the under side of the lug c and the thumb-nut 01 comes to a bearing upon the upper surface of the lug c. The parts are thus held together in the relative positions shown, the bar D being free to move upon hook-rod d as a pivot and the distancer E so adjusted as to hold the split collar at any desired distance along the axle from the harrow-disk. The knife-holder is then adjusted to the size of the harrow-disk by moving it lengthwise in the slot 6' on the bar D. The cylindrical central portion or shank 7c of the knife I is placed in the cylindrical recess 6 in the knife-holder F. Said knife-holder is then rotated in a plane parallel to a plane which is approximately determined by the axis of the disk-axle and the direction of the length of the main bar until the knife I will touch the cutting edge of the disk G at any angle de'- sired. The knife I is then rotated in the recess 0 until the sharp edge of the knife I presents the most efficient cutting-angle to the edge of the disk to be sharpened. lVhen these several adjustments are made, the knifeholder F and knife I are held firmly in place on the bar D by tightening the hook-bolt F. When the knife has been so adjusted that the lower edge touches the disk, then said disk is sharpened by a series of strokes in which the knife is pressed against the disk by moving the handle D laterally toward the disk and at the same time making a downward stroke. At the end of the stroke the handle is moved laterally, so that the knife leaves the disk, and the stroke is then repeated until the portion of the periphery of the disk operated on receives a sharp cutting edge. The disk is then turned, a fresh portion presented to the knife and sharpened in the same manner, and the operation repeated until the entire disk is sharpened. It is obvious that by this construction the device may be so adjusted as to sharpen the disk at the outer extremity, of the harrow and that by changing the adjustment of the knife. it may be made to sharpen two adjacent disks without removing the clamp from the axle or moving it along the axle, as illustrated by the full lines and dotted lines in Fig. 2; also, the device may be so adjusted that the knifeedge can be brought to bear against the concave as well as the convex edge of the harrow-disk.

The several adjustments of the knife may be made by merely loosening the thumb-nut e on the extremity of the hook-bolt F without detaching any part of the device. Another advantage of this construction is that as the knife-blades are sharpened along the edges which extend in the direction of the greatest length of the knife a greater extent of edge to be sharpened is presented than is found in prior constructions. Consequently as the knife is adjustable, so that any part of the length of the blade can be brought to bear on the edge of the disk, the frequency of removal of the knife for resharpening is by this construction greatly reduced.

In case any obstruction-as, for example, raised letters or figures-on the axle prevents the free rotation of the split collar upon said axle in the manner above described the rounded eye at the inner end of the main bar D may be placed in the hook d of the rod d, thus making a link-bearing for bar D and permitting operation of the device in a manner similar to the operation above described. In this case the washer H is placed in the space occupied in the first instance by the eye of the main bar D, thus holding the distancer E in its proper position in the lugs c and c of part B.

The washer H when .not in use may be placed upon the rod d, above the upper lug c of part B, for safe keeping.

It is obvious that, if desired, one of the blades 10 k of the knife may be dispensed with; also, that the shape of the blades may be changed so as to be beveled, or otherwise arranged to present different-shaped sharpening edges, longitudinally of the blade.

j usted in its distance from the disk-axle and rotated upon the longitudinal axis of the knife-shank, substantially as described.

2. In a disk-sharpener, a knife-holder and knife, so arranged that said knife is adjustable by rotation upon the longitudinal axis of the shank thereof, and also by rotation in a plane parallel to a plane which is approximately determined by the axis of the diskaxle and the direction of the length of the main bar.

3. In a disk-sharpener, a knife-holder and knife so arranged that said knife is adjustable in three different ways, namely; by rotation upon the longitudinal axis of the shank thereof; by rotation in a plane parallel to a plane which is approximately determined by the axis of the disk-axle and the direction of the length of the main bar; and also, longitudinally of the main bar.

, 4. In a disk-sharpener, the combination of a main bar attachable by suitable means to an axle bearing two or more disks, said main bar being movable in a plane at right angles to the length of said axle, and a knife located on said main bar and adjustable in such manner that the sharpening edge of said knife can bebrought to bear upon the edge of two adjacent disks Without detaching the knife from its holder.

5. In a disk-sharpener, the combination of a main bar substantially as described, attachable by suitable means to an axle bearing two or more disks, said main bar being movable in a plane at right angles to the length of said disk-axle, and a knife located on said main bar, and adjustable in such manner that the sharpening edge of such knife can be brought to bear upon the edge of either of two adjacent disks, Without detaching said disk-sharpener from the said disk-axle, and without detaching said knife from its holder.

6. A disk-sharpener, having a slotted main bar attached by any suitable means to the axle of the disk; a knife-holder having an aperture therein to receive a hook-bolt, and a rounded recess in said knife-holder to receive the shank, or rounded portion of the knife; in combination with a knife having a rounded shank and a blade, or blades, projecting therefrom, and a hook-bolt whereby said knife-holder is secured in the slot of the main bar and the shank of said knife secured in the recess on said knife-holder, substantially as described.

7. A disk-sharpener having a main bar with a knife and knife-holder arranged thereon, said main barbeing attached to the disk-axle by means of a split collar with lugs thereon, and a retaining-rod through said lugs forming a hinge for said main bar, substantially as described.

8. A disk-sharpener having a main bar with a knife and knife-holder arranged thereon, said main bar being attached to the disk-axle by means of a split collar with lugs thereon, and a hook-rod through said lugs forming a hinge for said main bar, said hook-bolt having thereon a hook to which the main bar may be attached by an eye in the inner extremity thereof, substantially as described.

9. In a disk-sharpener, the combination of a main bar attachable by suitable means to the disk-axle, and a knife having a cylindrical or substantially cylindrical shank, with one or more blades thereon; said blade or blades being so arranged as to act upon the disk or disks without removing such disk or disks from the disk-axle of the harrow to which the same belong.

10. In a disk-sharpener, a knife having a rounded shank and one or more blades attached thereto, said blade or blades having two sides parallel and two sides hollow-ground, substantially as described.

11. In a disk-sharpener,aknife having an intermediate, substantially cylindrical, shank portion, by means of which the knife is secured to its support, and one or,m0re cuttingblades on either side of said intermediate shank portion in right line therewith.

12. 111 a disk-sharpener,a knife-holder co1nposed of a block having an aperture therein, and a rounded recess in the face thereof to receive the shank of the knife, a hook-bolt passing through said aperture and through a slot on the main bar, whereby said block is clamped to the said bar; said hook-bolt be-.

in g adapted to fit over said recess in said knifeholder; in combination with aknife having a rounded shank, adapted to fit into said recess, and to be held in said block by said hookbolt, all substantially as described.

13. A disksharpener, having a main bar attached to the axle of the disk by any suitable means; a knife-holder adjustably attached to said main bar, and adapted to re ceive and hold the rounded shank of aknife; in combination wit-h a knife havinga rounded shank, and a projecting blade or blades attached thereto, and means for holding said knife upon said knife-holder in such manner that said knife may be adjusted in three differcnt directions, substantially as described.

It. The combination of the main bar D having the slot 6 therein, and eye a at the inner extremity thereof, the split collar composed of the parts A and B, said part B carrying lugs through which passes the hook-rod (Z carrying the hook (P, the distancer E, the knife-holder F, formed and arranged, as described, the hookbolt F, and the knife I, having the blades k and the rounded shank 7.7, all substantially as described.

15. A dislosliarpener, having a main bar so attachable to the disk-axle of the harrow that the main bar can be moved in a plane perpendicular to the length of the axle without rotating any part of the device upon said axle, and said sharpener operated without detaching the disk from the axle of the harrow, sub stantially as described.

PETER N. IIOXVE.

Witnesses:

JESSE Cox, HOW'ARD M. Cox. 

